United States Department of the Interior, U.S. Engineer's Office, Pittsburgh, Pennsylvania, Monongahela River, Locks 7 and 8, Greensboro, Greene County, Pennsylvania, Blueprints, 1924 August 6

United States Department of the Interior, U.S. Engineer's Office, Pittsburgh, Pennsylvania, Monongahela River, Locks 7 and 8, Greensboro, Greene County, Pennsylvania, Blueprints, 1924 August 6, Box: 107, Item: 284. Institute for the History of Technology and Industrial Archaeology Records, A&M 3936. West Virginia and Regional History Center. https://archives.lib.wvu.edu/repositories/2/archival_objects/156008 Accessed November 23, 2024.